Yep. And discharging them will be slow too! Things get kinda funky with this much energy storage. But maybe not a problem as the amp draws enough to discharge the caps pretty fast.
Wonder how long th amp would run with the power off? 30 seconds? Or maybe the tubes would be cool long before that.
Wonder how long th amp would run with the power off? 30 seconds? Or maybe the tubes would be cool long before that.
SSMH would be no issue here since it's a output cap coupled design.
I've always assumed that an amplifier may consume current unevenly on the positive/negative rails, and the output stage may remain on till a relatively low supply voltage as the two rails slowly start to fall, and the output DC may slowly get bigger as the amp turns off.
So, what I need is a low-pass filter, correct?
EDIT:
Confirming that I got this right:
An externally hosted image should be here but it was not working when we last tested it.
I am correct in this assumption, yes?
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Well, it's not necessary, but it's a damn good idea if you're tinkering with electronics. The resistance of skin is, at its least, 25k ohms, and it can take as little as 10mA to kill you. With a .33F cap, I would subject my body to 1.9mA. Enough that I can feel it, but not enough to kill. So I am not imminent danger with 48VDC. If, somehow, I was able to run the current through my innards, which is rated at ~100ohms, I would have 480mA running through my body. Given that death is almost certain at 500mA, I don't wanna take that chance.
Me neither. I might, might have some questions about stressing components as the caps discharge, but if there isn't a problem there I too see this as a fun mod that could very well have positive attributes. And since I have many headphone amps but all are solid-state, I'm kinda envious of your fun.
Well, I'll have it so that when I turn off the amp, the caps would cut from the circuit, and have the remaining charge be dissipated with a bleeding resistor. So:
An externally hosted image should be here but it was not working when we last tested it.
The amp itself will draw down the caps a good bit anyway. You might want to measure just how far they are down after 10, 20, 30 seconds. The bleeder cap may not be needed.
I don't think that 48 volts will be too dangerous to you, tho you can get a good tingle off a 48V battery. It's the damage you'd cause with a stray wire or stray screwdriver on those big caps. Guess how I know.
Just be aware that you're building a welding rig. No harm, unless you forget.
I don't think that 48 volts will be too dangerous to you, tho you can get a good tingle off a 48V battery. It's the damage you'd cause with a stray wire or stray screwdriver on those big caps. Guess how I know.
Just be aware that you're building a welding rig. No harm, unless you forget.- Status
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